DIXON performs Preliminary Maintenancel Inspection (PMI) on tanks to evaluate the coating's performance, quantify structural damage, review OSHA standards and EPA health requirements, and to evaluate the need for cathodic protection. Interior surfaces of the tank are thoroughly cleaned to remove sediment during the inspection. After the inspection is completed Dixon prepares a detailed report with photos and recommendations. Cost estimates are reported for all recommended work. The report serves as the basis for preparing specificaitons for tank repainting and repair.

High Pressure Cleaning

DIXON recommends high pressure cleaning during the PMI to remove seidment from the tank detect any deterioration of the steel, and also to perform an accurate adhesion test on the remaining coating. A high pressure water source from a community fire truck or our portable pressure washer are utilized.

Chlorination

After the PMI is complete, DIXON chlorinates the tank per AWWA D652 method 3. After acceptable bacteriological results are obtained the tank can be placed back in service..

Environmental Concerns

The existing coatings are sampled and analyzed for lead and chrome content. These results are evaluated in light of current OSHA and EPA standards and containment requirements.

General Recommendations

• Inspection Date: DIXON will arrange a date of inspection that is mutually agreeable. The tankr will be out of service until chlorination and testing is completed; approximately four days.
• Inspection Duration: DIXON performs an entire inspection within one day unless an excessive amount of mud is discovered.
• Sampling Tap: DIXON recommends installing a sampling tap if the tank does not have one.
• Pressure Relief Valves: Dixon can provide pressure relief valves to assist systems with only one tank in regulating pressures while the tank is out of service.